1 /* $OpenBSD: net.c,v 1.15 2023/02/08 08:24:29 tb Exp $ */ 2 3 /* 4 * Copyright (c) 1989 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/socket.h> 36 #include <netinet/in.h> 37 #include <arpa/inet.h> 38 #include <netdb.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <ctype.h> 42 #include <unistd.h> 43 #include <err.h> 44 #include "finger.h" 45 #include "extern.h" 46 47 void 48 netfinger(char *name) 49 { 50 FILE *fp; 51 int c, lastc; 52 int s; 53 char *host; 54 struct addrinfo hints, *res0, *res; 55 int error; 56 char hbuf[NI_MAXHOST]; 57 58 lastc = 0; 59 if (!(host = strrchr(name, '@'))) 60 return; 61 *host++ = '\0'; 62 memset(&hints, 0, sizeof(hints)); 63 hints.ai_family = PF_UNSPEC; 64 hints.ai_socktype = SOCK_STREAM; 65 error = getaddrinfo(host, "finger", &hints, &res0); 66 if (error) { 67 warnx("%s", gai_strerror(error)); 68 return; 69 } 70 71 s = -1; 72 for (res = res0; res; res = res->ai_next) { 73 if ((s = socket(res->ai_family, res->ai_socktype, 74 res->ai_protocol)) == -1) { 75 continue; 76 } 77 if (connect(s, res->ai_addr, res->ai_addrlen) == -1) { 78 (void)close(s); 79 s = -1; 80 continue; 81 } 82 83 break; 84 } 85 86 if (s == -1) { 87 perror("finger"); 88 freeaddrinfo(res0); 89 return; 90 } 91 92 /* have network connection; identify the host connected with */ 93 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf), 94 NULL, 0, NI_NUMERICHOST) != 0) { 95 strlcpy(hbuf, "(invalid)", sizeof hbuf); 96 } 97 (void)printf("[%s/%s]\n", host, hbuf); 98 99 freeaddrinfo(res0); 100 101 /* -l flag for remote fingerd */ 102 if (lflag) 103 write(s, "/W ", 3); 104 /* send the name followed by <CR><LF> */ 105 (void)write(s, name, strlen(name)); 106 (void)write(s, "\r\n", 2); 107 108 /* 109 * Read from the remote system; once we're connected, we assume some 110 * data. If none arrives, we hang until the user interrupts. 111 * 112 * If we see a <CR> or a <CR> with the high bit set, treat it as 113 * a newline; if followed by a newline character, only output one 114 * newline. 115 * 116 * Otherwise, all high bits are stripped; if it isn't printable and 117 * it isn't a space, we can simply set the 7th bit. Every ASCII 118 * character with bit 7 set is printable. 119 */ 120 if ((fp = fdopen(s, "r")) != NULL) 121 while ((c = getc(fp)) != EOF) { 122 c &= 0x7f; 123 if (c == '\r') { 124 if (lastc == '\r') 125 continue; 126 c = '\n'; 127 lastc = '\r'; 128 } else { 129 if (!isprint(c) && !isspace(c)) 130 c |= 0x40; 131 if (lastc != '\r' || c != '\n') 132 lastc = c; 133 else { 134 lastc = '\n'; 135 continue; 136 } 137 } 138 putchar(c); 139 } 140 if (lastc != '\n') 141 putchar('\n'); 142 (void)fclose(fp); 143 } 144